How to set CONTROLLERTYPE to heating

Hi Team,
I'm developing an exec with ST.
I declare a var as "lib.core.V1_0.B31_Reverse_On_Off_Control_Sequence".
By default it is setted for cooling.
I'm trying to set for heating.
If I use like this:
varname (CONTROLLERTYPE:=heating);
during the build it return the error:

"Error Executables Exe_Termo ..... can not find the object 'heating' in the current context"